var StringUtil = {
	uuid : function(len, radix) {
		var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
				.split('');
		var uuid = [], i;
		radix = radix || chars.length;
		if (len) {
			for (i = 0; i < len; i++)
				uuid[i] = chars[0 | Math.random() * radix];
		} else {
			var r;
			uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
			uuid[14] = '4';
			for (i = 0; i < 36; i++) {
				if (!uuid[i]) {
					r = 0 | Math.random() * 16;
					uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
				}
			}
		}
		return uuid.join('');
	}
};

String.prototype.trim=function()
{
     return this.replace(/(^\s*)|(\s*$)/g, '');
}
